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Organization and Summary of Accounting Policies - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
state
facility
Dec. 31, 2022
USD ($)
integer
Dec. 31, 2021
USD ($)
Product Information [Line Items]      
Number of surgical facilities owned | facility 162    
Number of states in which entity operates | state 33    
Number of surgical facilities owned, majority interest | facility 90    
Number of surgical facilities owned, consolidated | facility 123    
Revenues $ 2,743.3 $ 2,539.3 $ 2,225.1
Other current assets 96.5 79.0  
Other long-term assets 103.3 144.2  
Other current liabilities 204.1 210.1  
Other long-term liabilities 41.1 $ 75.4  
Number of deconsolidations | integer   2  
Third-Party Payors, Supplemental Reimbursement Programs      
Product Information [Line Items]      
Other current assets 17.2    
Other long-term assets 17.2    
Other current liabilities 5.2    
Other long-term liabilities 5.2    
2021 Cost Report | Idaho      
Product Information [Line Items]      
Revenues 17.2    
Provider taxes 3.1    
2023 and 2022 Cost Report      
Product Information [Line Items]      
Revenues 34.4    
Provider taxes $ 10.4    
Facilities, Ambulatory Surgery Centers      
Product Information [Line Items]      
Number of surgical facilities owned | facility 144    
Facilities, Surgical Hospitals      
Product Information [Line Items]      
Number of surgical facilities owned | facility 18